Tool holder



Aug. 23, 1932.- v

H. A. MYERS T001. HOLDER Filed Dec. 10. 1928 Patented Aug.123, 1932 l HERMAN A. MYERS, or WHITTIER, oALrronNIA rroorl HOLDER.

Y i .Application` Vfiled.v December 1'0, 1928. Serial No. 324,935. l l

This invention hasto do with a tool holder, and relates particularly to a tool holder adapted for usein lathes and like machines.

When it isI desired to turn a number of 5 articles of the same size and shape a lathe, it is necessary to set various cutting tools in the tool carrier successively and to feedthem in certain definite positions with relation to the lathe axis. If the articles being turned le have several parts 4of different diameters several settings of the` lathev tools are required at different distances fromthe axis of the lathe. It is also necessaryto measure the work eachtime a cutis made to determine 15 whether or not it is to the desired size. These operationsy consume considerable time and therefore add materially to the cost of production. v

It is an object of this invention Vto provide 2u a tool holder which facilitates rapid, accurate, setting of tools .in predetermined positions relative ltov the aXis of the lathe.

Another object of this invention is to provide a stop applicable to a lathe tool or the s like, to facilitate setting of the tool in a predetermined position in a holder.

It is another object'of this invention to provide a stop of the character mentioned embodying means whereby it can be efiectiveau ly adjusted to adjust the position of the tool relative to the holder. 7

It is a further object of this invention to provide a tool holder adapted to releasably hold tools carrying stop members so that the as stop members cooperate with the holder to locate the tool in predetermined positions in the holder.

Further objects and features of my invention will be best and more fully understood from the following detailedV description ofa typical form and application of the invention, throughout which description' I will refer to the accompanyingY drawing, in which Fig. 1 is a plan view of a typical latheV ab showing the device provided by this invenpiece.

14awhile the head 17 is movable transversely Vend of the body. The head 10a is in the form tion in operatingposition thereon, Fig. 2 is a plan viewV of thedefvifce apart from. the lathe, Fig. -3 is a view taken as indicated by line S-SonfFig. 2, Fig.f4 is an enlarged detailedlsectional view taken asindicatedy-by f I0 line 4-4 onFig.,3, F ig.,5 is a detailed 'sectional view taken as-indicated byline 5.-L5

lon Fig. 2; and Fig. 5 is an enlarged detailed view taken as indicated by line 6-6 on'Fig; v2. 4

In Fig. 1 of the drawing, the device provided by the invention is shown held in op'- erating position in alathe 0f typical construction. The lathe includes chassis or bed 13, a' carriage 14, a chuck 15, a tail piece, and various other parts commonto machines of this character. -A piece of work 16 ,is shown carried between the-chuck and the tail The device provided by this `invention is shown held in a'tool post 18 on ahead 17 mounted for transverse movement onthe carriage 14. Y

The Carriage 14 is movable longitudinally of the bed 13 `under control of a hand crank on the .carriageA under control of a'hand crank 17a. vThe position of the carriage is indicated by adial 14b on the carriage while the position of the head lis indicated by aV i dial17b on the carriage. Y The device provided by vthis invention inoludes, generally, a body 10 adapted to be held in the tool post of a lathe, a head 10a on the body to carry 'a tool, tool clamping means 1 1, carried by the body, and a gauge 12 to be applied to the tool `and to cooperate with the:head. Y l Q The bodvlO ofthe .device may be. formed vand proportioned to be clamped in the standard type of tool post 18. ',The body 10, in the preferred formof the invention, -isrectan- 95 gular in cross sectional configuration, Vand may be of any desired length. y

The head 10a ofthe device is formedon one of an enlargement on'the body, and' is an- 40 v`opening.

gularly disposed with reference to the body and projects from one side of the body so that its outer end 26 is located to one side of the body while its inner end is coincident with the inner end of the body as clearly shown in the drawing. The opposite side of the body Vis enlarged adjacent to end 21 of the head by a part 28. The outer side 25 of the head a extends between the ends of the head. The ends 21 and 26of the head are flat and at right angles to the longitudinal axis of Ythehead. .An openingup271eXtends centrallythrough' the head lOaflongitudinally of the head. The opening 27 isY provided to receive a standard type of lathe tool 28 and is preferably rectangularincrossflsectionk It is obvious that when the deviceis designed to hold tools of special shape/that the opening in the head1@ maybe formed.

to receive them.A Y substantially central rectangular opening 36,

` FAL-:centrally-Slocated opening ,.29 extends :longitudinally through Ithe YbodyflO. The

10p ening 29 .-is preferably round f andsextends intofand joins therectangular opening 27 in '5l-'z5 ftherfhead 10"?.y The opening ,29 is r provided witha restricted .portionihaving -a flatshoulder or fwall-'dfwhichf extendsgalonglone `side of :the4 openingfor a suitable .distance from itsinnerend'. Y

so .'.Theltool clamping .means .11 includesa Y v mandrelor rod 31andan actuating setscrew 32.` The. rod 31 is preferably Around and is `.-slidably .carried in the opening 29 of `the body. .The :rod31is provided at its .inner j:35 fendportion with. ai, reducedxpart havinga fiat .iside 32. The flatsides82 is somewhatilonger than fthe shoulder .30 ofnthefopening 29 ,and Aisprovidedto suitably engage thefshoulder '530 .tog prevent the v7rod from The rod 31 is angularly truncated .at its l'Innerfend sothatthe end 33 is disposedgpar-v -allelwith thetaXi-s oftheopening 27throu'gh thehead 10a. ATheend 33Y ofy therod is .adaptred-.to lit-"against or engage the` sidef 24,01? the ,.tool. 28 .which isin the opening 27. .@Therouter endfof therod 31 terminateswithinftheuter .endportion of theropening 29. Y

The rod 31 is adapted .to '.be actuatedpor 5,0 clamped .against a.toolf-.bythe set screw 32 .screwthreafded into the outer Aend Vof .the

Y .-opening 29 .sorthat it engagesthefouterend of therodl. The set screw321nay beprovvided with a polygonal headV asshown,` in ,the s drawings; .Theedgeatthe outer enldfof the rod 31 is bevele'd'to prevent the .endof ftheirodfrom-.spreading .and binding against thesidesiof the ,opening v29. V.The screw Aand' Lrod are connected so that the rod is .pulled i away-.from thetool whenthe screw is 'backed Y outoffthe opening 29. Inthepreferred-.con-

struction the ro.dend of theset .screwis -,pro-videdwithwa neck 60, and'is enlarged at :"63--t`o-form .a socket to carry the-.head 61. :In

, *1;65 manufacturethe parte;.justI described are Iasvrotating inthe sembled by pressing the rod on vor Varound-the neck and head soy that the rod and set screw form a permanent assembly. The construction allows the screw to turn free of the rod.

The tool gauge 12 includes a collar 35 adapted to be clamped on the tool 28, and to cooperatively engage the head 10a of the holder, means for setting the collar on the tool, and means for adjusting the cooperative relation of the colla-r with reference to the holder. The collar 35 is made to fit over the l.tool 2.8. In practice the .opening 36 through the collar maybe shaped to correl spond, generally, with the cross sectional conliguration of thetool 28, and the configuration v`'off the-exterior 6ft-thecollar may correspond, generally, to that of the opening 86. In the case "illustrated the exterior of the collar is rectangulariandthe collar is provided with a provided to freely receive the tool t28;

.The means provided-for setting-the-col lar onithetool-preferably comprises asset 'L screw; 38 carried by `.the collar to engage 'fthe tool. The set screw .may be l threaded in I.an .opening;8.8a formed. inthecollar transversely of the .axisV of, the .Qpenin g .36 through .the .col-

lar ,and .-so Ythat it extends n into the opening 86. .Theiinnerendiofthesetscrew 88 mayv yprojectinto.the opening -V56 lteeng'ageor clamp against a tool'28extending ,through -the opening'r. The outer end of theset .screw is .exposedsothat it can be engagedby a suitable Yoperating tool.

The means provided for adjusting :the col-V .lar with reference to the holdermaycompriseaset screw89 carried vbythe ccllaito cooperatively engage the holder. .The set screw 39 maybe-tlireaded-in an opening' 39a formed' through fthe y collar parallel with V:the opening 36 and .may `extend completely through thecollar from one end to the other ,softhat-ithescrew end of the set-screwmay be engagedA anV operating tool from the other ,end ofthe collar. In accordance with thein-V vention the-.collar Yis .split or provided hwith va cut 70 lextending.transversely of the open- ;ingBQaand thecollar is sprung so that the .screw is` alwaystight initheopening 39e. Y

In f the preferred arrangement the set screws are arranged together oradjacentone anotherlinsan ,enlargedpart87 of the collar .as shown throughout the drawing. Theset yscrews38 .and39 are preferably Yprovided withsocketfheads and-.do not normallypro'- ject.fromthecollar 85. The collar 35is not n connected or attached to the holder, andvwhen thetool28 is removed from the holder the collar 35 remains clamped Von thejtoolby .means `ofthe set ,screw 88. l

Inioperating the device the body 10 ofthe 'holder isrigidly clamped in the tool post, 18

-fatthe'desired cuttingangle.` VThe cutting tool 28is then clamped; inwthe opening 27-pofathe ofthe latheso that a tool 28 in the holderis ns'zavso head 10a at approximately the desired set-` erably adjacent the end 26 of the head. Thel tool may be adjusted in the holder by loosening the set screw 32 and moving the tool relative to the head by actuating the set screw 39 against the end' of the head 10a. When the tool is in the desired position in the holder the set screw 39 engages the holder and the set screws are all made tight and the cutting edge of the tool is brought to the cutting position relative to the axis of the lathe by means of the crank handle 17 a which controls the lead of the lathe carriage. The said position of the tool may be, in fact preferably is, obtained by feeding the tool to cut a piece of work in the lathe tov a desired dimension. The reading on the dial 17b is noted.

The tool 28 can thereafter be removed from the holder and replaced in the holder and brought to the said operating position whenever desired without measuring ork gauging it with reference to the work in the lathe. To return the tool to exactly the same position in which it was originally positioned to make a cut to a desired diameter, it is arranged in the holder so that the set screw 39 engages the holder, thus gauging the position of the tool in the holder whenever the tool may be set in the holder by set screw 32, and the hand crank 1'?aL operated to move the head of the carriage until the reading of the dial 171 corresponds to that previously noted. It is to be understood that the positioning of the collar on the tool is not to be disturbed after the original vsetting is made. It will be obvious that a plurality of tools 28 may be equipped with collars and a plurality of different operating positions determined for said tools by noting the dial readings. In this way a plurality of objects can be turned to like dimensions by suitable selection of tools and observations of dial readings, and without measuring each object as it is beingturned, as is ordinarily necessary. For purpose of example a typical operation will be described.

After a cut has been made following a setting of the tool, the tool is removed from the holder after loosening the set screw 32. 'Ihe collar is allowed to remain clamped on the tool. When a like cutis to be made on a subsequent piece of work, the same tool is inserted in the holder until the set screw 39 engages the end 26 of the head 10a. The set screw 32 is then tightened, clamping the tool in the holder. The hand crank is then actuated to advance the tool to the same position it was in when the said cut was made on the previous piece of work, this being done by operating the hand crank until the said dial reading is obtained. If there is more than one out or dimension to be made on each article,

the same method of tool setting is applied to several tools,that is,a` cutting tool and collar are provided-for each cut. The V4various tools `28 for the-different cuts, with-the collars" clamped on them, yare inserted into' the holder as'thepfvarious cuts areto'A be made. When ,the device provided by this invention is used, it-'is possible? to turn out a great number of identical pieces of workwith only one setting of the tools. Itis obviousthat the invention may be applied inmany ways .in machine shop practice.k For example,'iit may be usedll in a boring bar', or the like, and may be applied to various types of work.

It is to be noted that the head 10a does not extend to the top or bottom faces of the body 10 and that the axis of the opening 27 through the head is in a horizontall plane when the device is in operating position. The head is re- 'lated to the body as shown in the drawings and allows the holder to be arranged on a stepped tool post plate with the head extending freely over the step above the one on which the holder rests. The holder can therefore be firmly seated on a stepped tool post plate with the head extending to either side of the body. The opening 27 through the head being horizontal when the holder is in l operating position, allows the holder to be turned so that the head projects in either direction from the body or in either direction lengthwise of the work. Further, it is to be noted that the holder'can be set in a tool post with the tool 28 close to the post and therefore firm. Itis also to be noted that the active or cutting end of the tool 28 is substantially i line with the body being only slightly koi'se when the device is set, as shown in the drawings. This minimizes the tendency for the holder to twist or turn in the tool post.

I-Iaving described only a typical preferred form of my invention, I do not wish to limit myself to the specific vdetails set forth, but wish to reserve to myself any changes or variations that may appear to those skilled in the art or fall within the scope of the following j claims;

Having described my invention, I claim l. In combination, a tool,a body, releasable means for rigidly clamping the tool against movement relative to the body, and means for gauging the tool with respect to the body, including a collar detachably clamped on the tool at the exterior of the body, there being a 1 slit in the collar so that the collar has split portions, and a screw threaded transversely through the saidsplit portionsand adapted ,Y to engage the body, the split portions normally holding the screw against movement.

2. In combination, a tool, a body, releasable means for rigidly clamping the tool against movement relative to the body including a rod slidable in an opening in the body', a screw for actuating the-rod to clamp'it against the tool, a rotatable connecton'between the rod and sel-ew, end' Vmeans Vfor hodng the: rod against'. rotation, a collarl detachably cl'amped om theftooI at the exterior of the body,` Jchere being asltirn the body providing it Wlth split portions,l and a screw' threaded through a,KV transverse opening in the split: portions and adapted to engage. the body to gauge the tool, the split portions normallyholdng the sere-w Y against movement; Y

In wtnessthatl caim thev foregongI have hereunto subscribed my name this. 23rd day of November,.1.928.. Y

. Y HERMAN A,Y MYERS.v v 

